How could I run a Rigid Body simulation backwards after it is baked?
Option 1
For Rigid Body sim you can try  ... Bake simulation and with object selected search for Bake Action &gt; enable Visual Keying ... it converts cache into keyframed animation.


Now if yo go to Graph editor and move timeline into a middle frame of your anim, you can Mirror curves Ctrl+M Over Current Frame ... results as reverted animation.


Option 2
Another option can be Export as Alembic (.abc) and Import back ... under Constraints Properties you can animate Override frame value backwards - at frame 1 set value of end frame and on last frame keyframe value of 1 ...

Mentioned here